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Correction notice This article has been corrected since it published Online First. A typographical error in the last sentence has been corrected.
Contributors BG is the sole author responsible for the content of this article.
Funding The author’s work on COVID-19 is supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (grant: 2017/13552–2).
Competing interests None declared.
Provenance and peer review Commissioned; externally peer reviewed.